‘Red Delicious’ Apple Response to Low Dose Radiation

Abstract

Red Delicious' apples were tested for response to irradiation, at levels (0 to I .O KGy) sufficient for quarantine treatment, delivered up to 10 months postharvest. Treatment regimes simulated marketing sequences including a 60 day holding period following removal from controlled atmosphere storage. Irradiated apples were softer and had less acid, but there was a retardation of the hydrolysis of starch. Irradiation effects were not accentuated with longer storage or during ripening. After I1 months of storage all the apples in this study were 6.7 ( N ) jirmer than the Washington State export standard. The quality of all treated fruit were acceptable for marketing.

Quality of apples following gamma irradiation and cold storage

“…Cultivar 'Rich-A-Red' showed a distinct dosedependent progressive decrease in acidity during storage. This is in agreement with the accelerated loss of titratable acids observed in irradiated apples by other workers (Fernandez & Clark, 1962;Saito & Igarashi, 1970;Narvaiz et al, 1988;Olson et al, 1989). Similarly, pulp pH showed a dose-dependent gradual increase during storage (Figure 4) Means in a column for each cultivar followed by a different letter are significantly different (P < 0.05) in comparison to control.…”

“…Thomas, 1986;Olson et al, 1989;Angerilli & Fitzgibbon, 1990;Drake & Nelson, 1990; Chai et al, 199 1 ; Lu et al, 199 1 ; Tobias et al, 1993). Irradiation at doses varying from 0.1 to 0.6 kGy did not show any apparent effect on the external appearance, colour, firmness,Int J Food Sci Nutr Downloaded from informahealthcare.com by Nyu Medical Center on 06/22/15 For personal use only.…”

Gamma radiation control quality and lignification of bamboo shoots ( Phyllostachys praecox f . prevernalis. ) stored at low temperature

“…Results above showed the ability of gamma radiation to delay TS content decrease and RS accumulation, which may due to the suppression on respiration of bamboo shoots and delay in starch hydrolysis by gamma radiation. Retardation on the hydrolysis of starch by gamma radiation has also been observed in apple (Olsen et al, 1989), and reduction on the rate of RS content increase by gamma radiation is in agreement with study in mango (Mahto and Das, 2013).…”

RESPONSE of APPLE and WINTERPEAR FRUIT QUALITY to IRRADIATION AS A QUARANTINE TREATMENT

“…Firmness of 'Granny Smith' apples was affected more than that of other cultivars by irradiation. Loss of firmness due to irradiation has been noted previously in apples (Olsen et al 1989). However, firmness of all cultivars in this study would either meet or exceed the minimum acceptable level of 53.4 N established for Washington State apples (Washington Agriculture Code, Olsen et ai.…”